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Stockholders' Equity (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2019 USD ($) vote $ / shares shares	Jun. 30, 2018 USD ($) shares
Accumulated Other Comprehensive Income (Loss) [Line Items]
Common stock shares authorized (in shares) | shares	300,000,000.0		300,000,000.0
Common stock par value (USD per share) | $ / shares	$ 0.01		$ 0.01
Preferred stock authorized shares (in shares) | shares	10,000,000.0		10,000,000.0
Preferred stock par or stated value (in dollars per share) | $ / shares	$ 0.01		$ 0.01
Common stock, number of votes granted per common share held | vote			1
Treasury stock, shares, acquired (in shares) | shares	24,170	0	39,901	0
Payments for repurchase of common stock	$ 1.5		$ 2.3
Value of treasury stock acquired	1.8	$ 0.1	5.5	$ 3.0
February 2016 Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Remaining shares under share repurchase authorization	224.6		224.6
NEW YORK STOCK EXCHANGE, INC. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Value of treasury stock acquired	$ 0.3	$ 0.1	$ 3.2	$ 3.0

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